JP4512683B2 - Rubber impeller replacement tool - Google Patents

Description

The present invention relates to an exchange tool used for exchanging a rubber impeller of a rubber impeller pump.

The rubber impeller will be described with reference to FIG. 7. The rubber impeller is composed of a plurality of rubber impeller fins 8-1 welded around a brass boss 13 and accommodated in the pump casing 12. At the center of the pump casing, there is a drive shaft 11 with spline grooves formed thereon, and the rubber impeller is driven by this drive shaft.

Since the rubber impeller rotates while being pressed against the pump casing inner surface 10 by the elasticity of its own rubber, the rubber impeller fin portion 8-1 is cracked or reduced in elasticity due to wear of the rubber impeller fin tip 8-2 or aging of the rubber. Therefore, it is necessary to periodically check or replace the rubber impeller as a consumable part.

Therefore, it is necessary to pull out the rubber impeller from the pump casing in order to check the wear and cracks of the rubber impeller when replacing or checking the impeller. For this reason, it is currently carried out with a tool dedicated to pulling out the rubber impeller.

Such a rubber impeller extraction-dedicated tool is described in, for example, Japanese Patent Application Laid-Open No. 2004-108305. The rubber impeller extraction-dedicated tool described there will be described with reference to FIGS. 8 and 9. There are arms 19 with metal sharp claws 18 on both sides across the center bolt 15 and the center nut portion 16-1. Insert the arm so as to be sandwiched between the fins of the rubber impeller. Thereafter, the claw at the end of the arm is pressed against the rubber impeller body from the left and right by the right and left fixing push bolts 14, and the claw is pierced to fix the tool to the rubber impeller. Thereafter, the rubber impeller can be pulled out by reaction by rotating the center bolt and projecting it from the lower part of the center nut 16-1 and pushing the drive shaft at the center bolt tip.
JP 2004-108305 A

However, such a tool for extracting a rubber impeller has the following problems.
In order to mount the rubber impeller extraction dedicated tool in the pump casing, a space from the upper end of the center bolt to the lower end of the arm tip claw 18 is required as described with reference to FIG. However, in practice, this space may not be secured, so the pump mounting bolts are removed and the pump body is moved to secure the space before the work is performed. When this method is not possible, there is no method other than removing the rubber impeller with a special tool such as pliers or pliers because it cannot be used.

In addition, the frictional resistance due to the contact between the inner surface of the pump casing and the rubber impeller fin is large, and in order to pull out the rubber impeller, it is necessary to firmly bite the claw of the rubber impeller extraction dedicated tool. However, as can be seen from the ratio of the dimension from the force point 16 to the fulcrum 17 and the dimension from the fulcrum 17 to the action point 18, as shown in FIG. 8, in order to bite the 18 claw into the rubber impeller, Must be tightened with considerable torque. Depending on the location where the work space is small or the installation location, the operation may be difficult and the work time may be prolonged.

There is no problem because the rubber impeller will not be reused when replacing the rubber impeller. There are cases where it is not possible.

In addition, such a rubber impeller extraction tool has sufficient work space, and it is good if you can work while visually observing the inside of the pump casing, but if the work space is small or depending on the installation location of the pump, you can see inside the pump casing. It may be difficult to mount and operate the rubber impeller extraction tool.

Further, such a rubber impeller extraction tool is a tool used only for removing the rubber impeller. When the rubber impeller is mounted in the pump casing again, it is necessary to push it in by hand and hit it with a plastic hammer if necessary. However, due to space limitations, it may be difficult to use a plastic hammer or the like.

It is an object of the present invention to solve the above-mentioned problems and to perform a rubber impeller replacement operation safely and in a short time.

Means to solve the problem

In order to solve the above-mentioned problem, a tool for extracting and remounting a water turbine-shaped rubber impeller having a plurality of rubber fins around a boss housed in a cylindrical pump casing, the pump casing inner surface and the rubber impeller We considered an exchange tool that consists of a thin cylindrical part inserted between them and a handle provided on the upper part.

First, the rubber impeller extraction method using the rubber impeller replacement tool of the present invention will be described. The thin plate-like cylindrical portion is pushed in while manually rotating between the pump casing inner surface and the rubber impeller. The tip portion of the rubber impeller enters the thin cylindrical cylinder of the rubber impeller replacement tool while falling down along the rotation direction of the thin cylindrical cylinder of the rubber impeller replacement tool, and therefore can be pushed easily to the bottom with little resistance.

When pulling out, pulling the thin cylindrical part of the rubber impeller replacement tool without rotation, the tip of the rubber impeller is pressed into the thin cylindrical part of the rubber impeller replacement tool by the elasticity of its own rubber, and the inner surface of the thin cylindrical cylinder Due to the frictional resistance of the rubber impeller, the rubber impeller is held in a thin cylinder of the rubber impeller replacement tool.

At this time, an appropriate gap is provided between the outer diameter of the thin cylindrical cylinder, the inner surface of the pump casing, and between the rubber impeller drive shaft and the rubber impeller labs, and there is almost no resistance between them, so the rubber impeller is damaged in a short time. The rubber impeller can be extracted together with the rubber impeller replacement tool.

Next, a rubber impeller mounting method using the rubber impeller replacement tool will be described. A rubber impeller is mounted in advance in a thin cylindrical cylinder of the rubber impeller replacement tool. The rubber impeller replacement tool is pushed straight to the bottom of the pump casing without rotating the rubber impeller replacement tool while aligning the spline with the boss portion of the rubber impeller mounted in the thin plate cylinder to the rubber impeller drive shaft in the pump casing.

Thereafter, the rubber impeller replacement tool is again rotated by hand to extract only the rubber impeller replacement tool. The rubber impeller drive shaft is directly connected to the motor or engine and does not rotate. By rotating the rubber impeller replacement tool, the tip portion of the rubber impeller falls down along the rotation direction, and the frictional resistance between the thin cylindrical inner surface of the rubber impeller replacement tool and the rubber impeller decreases.

However, the frictional resistance between the rubber impeller drive shaft and the rubber impeller boss increases by manually rotating the rubber impeller replacement tool. Since the frictional resistance between the rubber impeller drive shaft and the rubber impeller boss is superior to the frictional resistance between the thin cylindrical inner surface of the rubber impeller replacement tool and the rubber impeller, only the rubber impeller replacement tool can be extracted.

Also, a rubber impeller replacement tool characterized by providing a protrusion-like guide at the lower end of the thin cylindrical portion of the rubber impeller replacement tool was considered.

The operation of the projecting guide at the lower end of the thin cylindrical portion of the rubber impeller replacement tool will be described. When this guide is inserted between the fins of the rubber impeller in the pump casing and pushed while rotating the rubber impeller replacement tool by hand, the projecting guide The thin cylindrical part of the rubber impeller replacement tool can be inserted while the guide slides along the inner surface of the pump casing, so the thin cylindrical part of the rubber impeller replacement tool and the inner surface of the pump casing are misaligned even when the work space is small and cannot be seen. Easy operation.

Furthermore, a rubber impeller replacement tool characterized by being able to work in a narrow space by allowing the handle portion of the rubber impeller replacement tool to be replaced has been considered.

The invention's effect

Since the present invention is composed of a thin cylindrical part and a handle part attached to the upper part thereof, it is easy to operate. Therefore, even in a small space, the rubber impeller can be pulled out and attached without scratching, and a hammer can be used. It is possible to work safely because there is no need to hit it with etc.

In addition, since the present invention has a projection-like guide at the lower end of the thin plate-like cylindrical portion, even if the working space is small and cannot be visually observed, the rubber impeller replacement tool can be easily operated without shifting.

Furthermore, since the handle portion can be exchanged in the present invention, the rubber impeller exchange tool can be used in accordance with the space around the pump, etc., so that it can correspond to various work spaces.

A specific embodiment of the rubber impeller replacement tool of the present invention will be described with reference to FIG. When this thin cylindrical part is inserted between the rubber impeller and the pump casing, it is difficult to insert due to the elasticity of the rubber impeller and may be displaced. The guide 7 was attached. By inserting this guide between the fins of the rubber impeller in the pump casing, the thin plate cylinder and the pump casing can be operated without shifting.

Further, the handle of the rubber impeller replacement tool will be described with reference to FIG. 1. A metal fitting 1 for attaching various handles to the upper end of the thin plate-like cylinder is attached in order to obtain an optimum tool shape depending on the work space or the like. The metal fitting 1 at the upper end of the thin plate-like cylinder has two screws 1-1 and can be tightened by tightening a bolt. Also, each handle shown in FIGS. 2 and 3 has two bolt holes 3, which are used by fixing the handle to the metal fitting at the upper end of the thin plate-like cylinder with a bolt.

The selection of the handle will be described with reference to FIG. 2, FIG. 3, FIG. 5 and FIG. 5. If there is sufficient space with the rubber impeller removal side in front, use the handle in FIG. If it is, it will be in the state of FIG. 4, and since it can use both hands, it can work more easily.

In addition, if the space of the pump is narrow due to the mounting direction or mounting location of the pump and the handle of FIG. 2 cannot be used, the handle of FIG. 3 can be used, and the state shown in FIG. .

Further, the metal fitting 1 at the upper end of the thin plate-like cylinder shown in FIG. 1 has a ratchet wrench insertion hole 2 at one location, so that the space for extracting the rubber impeller is small, and if the handle cannot be operated, the ratchet wrench can assist.

The height from the upper end of the thin plate cylinder to the guide tip at the lower end is approximately the same as the thickness of the rubber impeller, and the outer size of the thin plate cylinder is a size 6 slightly smaller than the minimum inner diameter of the pump casing inner surface 10 in FIG. Since the size of the rubber impeller changes depending on the capacity of the pump, a rubber impeller replacement tool suitable for the size of the pump is required.

  A side view of a thin plate cylinder with a handle fitting at the upper end and a guide at the lower end.   An example of a handle   Other examples of handles   An example in which the handle of FIG. 2 is attached to a thin plate cylinder.   An example in which the handle of FIG. 3 is attached to a thin plate cylinder.   The figure in use of the rubber impeller exchange tool of this invention.   FIG.   Sectional drawing of FIG. 9B-B in use of the conventional tool only for rubber impeller extraction.   Sectional drawing of FIG. 8A-A in use of the conventional tool only for rubber impeller extraction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mounting bracket 1-1 Mounting screw hole 2 Ratchet handle mounting hole 3 Mounting bolt hole 4 Gripping part 5 Mounting bolt 6 Thin plate-like cylindrical part of rubber impeller replacement tool of the present invention 7 Protruding guide 8 Rubber impeller 8-1 Rubber Impeller fin 8-2 Rubber impeller fin tip 10 Pump casing inner surface 11 Rubber impeller drive shaft 12 Pump casing 13 Rubber impeller boss part 14 Fixing bolt 15 Center bolt 16 Force point 17 Support point 18 Action point claw part 19 Arm

Claims (3)

A tool for extracting and remounting a water turbine-shaped rubber impeller having a plurality of rubber fins centered on a boss housed in a cylindrical pump casing, which is inserted between the inner surface of the pump casing and the rubber impeller. A rubber impeller replacement tool characterized by comprising a cylindrical part and a handle part attached to the upper part. The rubber impeller replacement tool according to claim 1, wherein a projection-like guide is provided at the lower end of the thin plate-like cylindrical portion. The rubber impeller replacement tool according to claim 1, wherein the handle portion can be replaced.